Lincoln Electric SVM114-C Figure F.22. Plug Locations for L12253- Control Board, J14

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F-37	TROUBLESHOOTING AND REPAIR	F-37
	FIGURE F.22. - PLUG LOCATIONS FOR L12253-[ ] CONTROL BOARD

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						R108
			C34
D55		DZ10
D55							X5
							X5
R113	D52	D47	C40	C32	R55	R90	R70	C22	D53	R85
	DZ12			DZ17
							DZ16		DZ15	D49
D51			C45
D51
								C43		DZ18
		R110		X7			R109			C47
		R110				R96	R109	C37		C47

	R36
				Q7		R75
						R75
	R84
R66	C31	R86	R94
R101	R104	R99	R100	R105	R102	R103
R101	R104	R99	R98
				C42
				Q8
	R112				R106
	D54				R92
				C38

D20

R76

R77

R79

R78

R83

R81

R80

R82

T1

C36

X6

Q1

R65

D19

R62

R27

R21

R4

C6

D8

R17

R18

R20

R67

CONTROL

L12253-4

DZ1

C30

D7

Q2

D43

D22

C44

C35

D21

R69

D29

C5

R33

R24

R64

X1

C19

R15

R60

C41

C33

D56

DZ13

DZ14

T2

D9

D34

R61

C27

R32

R23

R14

R63

R59

R68

R19

R72

D6

C21

D35

C4

D28

C3

C2

D42

R91

C10

DZ4

R88

R89

R115

R114

R121

C17

DZ11

D1

D12

D13

R13

C14

R71

D40

D41

D3

D46

Q10

R119

R22

R74

C8

D25

R9

R48

R2

Q3

DZ3

C18

R120

X4

X3

C15

X2

C16

R16

C7

D24

R7

C12

R11

D11

D36

D17

R12

C13

D18

R6

R35

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R107	R97	C24	R95	C20		R34
						R34
D48						R37
D48
				D44	C29	TP1

	C39	667
	621	667
	621

J1

C1
DZ2			R56	D38
DZ2	R5	D2
Q4			R58	R41
		R1	R58	R41

J3

R38

D27

R73

C9

D39

R31

R116

C48

R117

R118

Q9

D26

R3

D10

D15

D16

R54

R46

R47

R49

R45

R52

R53

C26

D37

D14

C23

R25

R26

R10

C11

R50

R51

D32

R28

D4

R44

R30

Q6

D5

R43

R29

Q5

555

R57

J14

691

D33

		R111
	J4	C46
	J4	J2
		J2

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500 512

Contactor

690

LN-25™

Image 75

Contents Semiautomatic Wire Feeder California Proposition 65 Warnings SafetyElectric Shock can kill Fumes and GasesCan be dangerous Welding and Cutting Sparks can Cause fire or explosion Cylinder may explode if damagedIii Sûreté Pour Soudage a L’Arc Précautions DE SûretéMaster Table of Contents for ALL Sections Installation Section Table of ContentsCurrentrent InstallationTechnical Specifications LN-25 Wire Feed SpeedPower Source Connection Safety PrecautionsFor GMA GUN and Cables INVERTEC, CV300 and Other Newer Lincoln Power SourcesGUN Cable Connection to Feeder With CV AdapterWork Cable Connection Wire Feed Drive Roll and Guide Tube KitsWeld Cable Connection Electrode Cable ConnectionLN-25 Operation Section Operation Welding CapabilityRead and Understand Entire Section Before Operating Machine LN-25 Instruments Controls Electrode Polarity SwitchWire Feed Mode Switch Wire Speed Dial and Range SwitchRemote ARC Voltage Control Optional GAS Post PRE-FLOW Timers OptionalWork Clip Lead AWGMounting 10 to 30 LB Spools Sequence of OperationLoading Electrode Mounting 22 to 30 LB READI-REELCOILS6OPERATIONB-6 Loading Wire DriveIdle Roll Pressure Setting Grooves READI-REEL Inside Cage WiresMinimum Arc Volts Presetting Wire Feed SpeedSetting Constant Wire Feed Speed CV Mode Setting ARC Sensing Wire Feed Speed CC ModeMaking a Weld Figure B.4 VV CC Wire Speed SettingProcedure AT END of Coil WeldingCylinder may explode if damaged Circuit Protection and Automatic Shutdown Overvoltage ShutdownMotor Overload Shutdown Accessories Section C Accessories SectionTable C.1 AccessoriesLN-25 Option Chart How to use Table C.1Optional Accessories K434-1 GAS Flow Timer KITGAS Solenoid KIT K430-2 for Codes LN-25 Contactor KIT K443-1 for Codes K433 Power Source Remote BOXK432 Remote Control Cable Assembly Remote Output Control Options and Control Cable AssembliesK444, K444-1 or K444-2 Remote Voltage Control KIT K439 Remote Extension Cable AssemblyK625, K626, K627 Remote Control Cable Assembly K624-1 42V Remote Output Control ModuleDIA. Hole Connector Must be Insulated in this AreaTo GUN Switch Connect Leads to Pins a and C Style aMaintenance Section Maintenance Routine MaintenanceAdjusting Speed Sensor Module Calibration of LN-25 Wire Speed Dial LN-25 Theory of Operation Section Figure E.1 Theory of Operation Block DiagramControl Circuit Operation Input Power CircuitTheory of Operation General DescriptionTrigger Circuit Feedback and Control CircuitsLater Models Optional CircuitsContactor GAS SolenoidControl PC Board Fuses Protective Devices CircuitsLN-25 Troubleshooting and Repair Section HOW to USE Troubleshooting Guide 2TROUBLESHOOTING and REPAIRF-2PC Board Troubleshooting Procedures Troubleshooting and RepairFeeding Problems Feeding Problems Hall Effect For Codes below 10500 only GAS Solenoid Valve and Solenoid PC Board TestTest Description Materials NeededGAS Solenoid Valve Test ProcedureScrew Wire Reel Retaining Collar Case DoorFigure F.2 Solenoid Leads Troubleshooting and Repair PC Board for K430 GAS Solenoid KIT GAS Solenoid Valve and Solenoid PC Board Test512 624A 621 J11LN-25 For Codes Above 10500 only GAS Solenoid Valve and Control PC Board TestFigure F.5 Control BOX Cover Removal For Codes Above 10500 onlyFigure F.6. Solenoid Leads Solenoid LeadsControl PC Board Solenoid Circuitry Test Figure F.7. Applied Voltage Polarity667 555 691 621 500 512 690 G3425LN-25 Hall Effect Module Test Hall Effect Module Test G2196 539 541 500539 G1757 Figure F.11 Control PC Board Codes Above LN-25 Wire Drive Motor Test Drive Motor Lead IN-LINE Connector Hall Effect Module Contactor & Contactor PC Board Test Contactor & Contactor PC Board Test Contactor Test ProcedureContactor Coil Leads S2096328TROUBLESHOOTING and Repair F-28 Contactor PC Board Test667 J14 LN-25 Tools Required Contactor PC Board ReplacementRepair Procedure Contactor PC Board Replacement33TROUBLESHOOTING and Repair F-33 Figure F.17 Control PC Board Replacement Figure F.21. Control PC Board Codes 9812 and below Control PC Board ReplacementJ14 Figure F.22. Plug Locations for L12253- Control BoardFigure F.24. Control Board Replacement PC Board Screw For Codes below Contactor ReplacementContactor Replacement 40TROUBLESHOOTING and Repair F-40For Codes Above Figure F.26 Phillips Head Screwdriver Wrench Pliers GAS Solenoid Present ReplacementPurge Switch Leads Solenoid Plug J11 GAS Solenoid Valve AND/OR Solenoid PC Board ifFigure F.29. Solenoid Assembly Wiring Codes 9812 and below Figure F.31. GAS Solenoid Assembly for Earlier Codes Phillips Head Screwdriver Wrench Slot Head Screwdriver Mylar Insulation Electrode Cable 48TROUBLESHOOTING and Repair F-48Drive Motor and Gearbox Replacement and Access to Hall Effect ModuleG1757 Figure F.34. Drive Motor Replacement Retest After Repair LN-25 Table of Contents Electrical Diagrams Section Electrical DiagramsOptional 42 Volt Remote Output Control Wiring Diagram Above Code 11140 G4679Wiring Diagram Code 10556 Thru 10500 L10925 Wiring Diagram Code 10100 Thru 10500 L9644 Wiring Diagram below Code 9900 L7545 LN-25 Across the ARC Model Schematic Complete Machine Codes Above 11140 G5366Schematic Complete Machine below Code 9900 only G1833 Schematic Control PC BD Above Code 11140 G4616-5 Schematic Control PC BD Code 10556 Thru 10558 G3424-3 Schematic Control PC BD Code 10100 Thru 10500 G2194 PC Board Assembly Control Abovr Code 11140 L12253-3 L12253L12253-3 G3425 PC Board Assembly Control Code 10556 Thru 10558 G3425-3PC Board Assembly Control Code 10100 Thru 10500 G2196-1 LN-25 Control PC Board Assembly Control below Code 9900 G1757-6Contactor Schematic Contactor PC BD Above Code 10500 M10965Schematic Contactor PC BD Code 10100 Thru 10500 M17621 Electrical Diagrams Electrical Diagrams L10863 PC Board Assembly Contactor Above Code 10500 L10863-1PC Board Assembly Contactor Code 10100 Thru 10500 L9670-1 PC Board Assembly Contactor below Code 9900 L9185-2